Massive WDM systems: recent developments and future prospects

Abstract

This paper reviews the main drivers of the recent evolution of WDM systems and some expected ,further developments in terms of system design and technologies.The increase of the uvailable bandwidth, the seek for a larger spectral efliciency, fhe reach of longer distances are discussed along with the related technologies such as new modulation techniques, Raman amplijkation and,fomwr.d error correction.

External cavity multiwavelength semiconductor mode-locked lasers gain dynamics

“…The SOA gain change resulting from the amplification of a pulse is equal to the convolution of the intensity pulse profile and the impulse response: (2) In the pump-probe measurements of the SOA gain dynamics presented in this paper, the probe power was measured as a function of the delay between the pump and probe using a slow photo detector which averages the probe power over time, thus the measured probe signal is equivalent to the cross-correlation of the probe pulse intensity profile and the gain changes induced by the pump pulses:…”

“…Time division multiplexing (TDM) and wavelength division multiplexing (WDM) are techniques used to exploit the information transmission capabilities of optical fiber communication systems, reaching terabits per second transmission rates [1][2][3]. The availability of compact, reliable and cost effective multiwavelength pulse sources is of great importance for these systems.…”

In-Fieldn× 40 Gb/s Transmission Experiments with In-Line All-Optical Wavelength Conversion

“…High-performance future telecommunication networks will be based on the dense wavelength division multiplexing (DWDM) [1,2] technique, and on signals that will be processed at node sites by means of all-optical devices such as optical cross connects (OXC), optical add drop multiplexers (OADM), and all-optical wavelength converters (AOWC) [3]. Furthermore, due to traffic growth and to the ever-increasing number of accomplishments within 40-Gbit/s field trials, we believe that future telecommunication transport networks, especially those operating over wide geographical areas, will be based on N × 40 Gbit/s transmission systems [4], even though the network design in this environment requires many ingenious contrivances [5][6][7].…”